Update app.py

app.py

@@ -327,7 +327,7 @@ def generate_chat_response(message, chat_history_from_client):
     response = None
 
     try:
-        model = genai.GenerativeModel('learnlm-2.0-flash-experimental', system_instruction=system_instruction_content)
+        model = genai.GenerativeModel('gemma-3-27b-it', system_instruction=system_instruction_content)
 
         model_chat_history_for_gemini = []
         for entry in chat_history_from_client: